Photoelectric Sensors

Photoelectric sensors detect and measure physical objects or quantities by emitting a field or beam of electromagnetic radiation, an object is detected by measuring alterations in the return signal. There are 3 main types of photoelectric sensors which provide reliable detection, these are through-beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects or measure the distance to the object.


Through-beam Sensors


Through-beam sensors (aka thru-beam) rely on two separate housings, one for the transmitter and one for the receiver, with the transmitter providing a continuous beam of light to the receiver. Each time an object passes through the beam this interrupts the signal between the transmitter and receiver, which in turn causes the receiver to send an electrical signal to the output. Through-beam sensors are suited to long-distance sensing and are capable of detecting almost any object, irrespective of colour or angular motion.


Retro-reflective Sensors


Retro-reflective photoelectric sensors (retroreflective) have both the transmitter and receiver contained within the same housing but require a reflector opposite to the sensor. The reflector bounces the light beam back to the transmitter until an object breaks the beam. Objects which are highly reflective such as aluminium require sensors with polarising filters. The filter allows the sensor to acknowledge that the reflected light from reflecting materials is different from the reflector.


Diffuse Sensors


Diffuse sensors (proximity sensor) are easier to install as only one device has to be mounted. This is because the transmitter and receiver are contained within one housing. Diffuse sensors use the reflection from the target object within a predetermined sensing range. The transmitter sends out a continuous beam of light, once this hits the target it is diffused in all directions, a part of this light is reflected back and recognised by the receiver, the receiver then sends an electrical signal to the output.


A special type of diffused mode is background suppression which enables the user to precisely control the sensing range. A diffuse mode sensor with background suppression is less sensitive to the target colour. They can also use a visible red light or infrared light sources.


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Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 847-9417
Mfr. Part No.QS18VP6RQ5
BrandBanner
$176.55
Each
units
Barrel Through Beam (Receiver) 20 m PNP 4-Pin Connector - - 30V - LED IP67 25 mA - 375 μs, 750 μs
RS Stock No. 192-6576
Mfr. Part No.Q5XKLAF2000-Q8
BrandBanner
$763.25
Each
units
Rectangular Background/Foreground Suppression 95 → 2000 mm PNP/NPN M12 Connector - IO-LINK 30V M12 Connector LED IP67 50 mA IO-Link 3 ms
New
RS Stock No. 205-5094
Mfr. Part No.WL250-2N1131
BrandSick
$263.22
Each
units
Rectangular Retro Reflective 12 m NPN Cable - - 30V 4-pin LED IP67 - - 500 μs
RS Stock No. 195-1790
Mfr. Part No.XUX8AKSAT16
$337.50
Each
units
Compact Diffuse with Background Suppression 2 m NC, NO, NPN, PNP 1 x 0.75 → 1 x 1.5 mm² Screw-Clamp Terminal - - 24 V, 36 V Screw-Clamp LED IP30, IP65, IP67 100 mA - 3.5 ms
New
RS Stock No. 205-4832
Mfr. Part No.GRL18S-K2436
BrandSick
$115.00
Each
units
Barrel Retro Reflective 7.2 m PNP Connector M12 - - 30V 4-pin PinPoint LED IP67 - - 500 μs
New
RS Stock No. 205-4996
Mfr. Part No.GL10-F4111
BrandSick
$137.43
Each
units
Rectangular Retro Reflective 12 m PNP Connector M12 - - 30V 4-pin PinPoint LED IP67 - - 500 μs
New
RS Stock No. 205-5198
Mfr. Part No.WL9-3P2262
BrandSick
$240.00
Each
units
Rectangular Retro Reflective 400 mm PNP Connector M8 - - 30V 4-pin LED IP66, IP67, IP69K - - 500 μs
New
RS Stock No. 205-5154
Mfr. Part No.HL18-A4A3BA
BrandSick
$182.91
Each
units
Block Retro Reflective 6.5 m NPN, PNP Connector M12 - - 30V 4-pin LED IP67, IP69K - - 500 μs
RS Stock No. 187-4861
Mfr. Part No.SLLP3002M5
BrandBulgin
$141.22
Each
units
- Diffuse Reflective 2 → 30 mm NPN M5 - - 24V M5 Connector Red LED IP67 11 mA - <500 μs
New
RS Stock No. 201-0816
Mfr. Part No.S1430ROS915
$698.30
Each
units
Block Retroreflective - Relay Plug - - - - - - - - -
RS Stock No. 695-6836
Mfr. Part No.XUK1APANM12
$160.97
Each
units
Compact Retroreflective 7 m PNP 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <2 ms
New
RS Stock No. 205-4952
Mfr. Part No.WLG4SC-3P3232B01
BrandSick
$315.00
Each
units
Rectangular Retro Reflective 5 m PNP Cable with connector - - 30V 4-pin PinPoint LED IP66, IP67 - IO-Link 500 μs
RS Stock No. 134-7796
Mfr. Part No.WSE9LC-3P2436A00
BrandSick
$450.00
Each
units
Block Through Beam (Emitter and Receiver) 0 → 60 m PNP 4-Pin M12 Connector - IO-LINK 30V 4-Pin Connector LED IP66, IP67, IP69K 30 mA IO-Link <500 μs
RS Stock No. 176-9847
Mfr. Part No.QS18VN6LVQ8
BrandBanner
$183.51
Each
units
Block Through Beam 6.5 m NPN M12 Connector - - 30V Connector LED IP67 - - 600 μs
New
RS Stock No. 205-5111
Mfr. Part No.VL18-4P3140
BrandSick
$130.00
Each
units
Barrel Retro Reflective 3.7 m PNP Connector M12 - - 30V 4-pin LED IP67 - - 2 ms
RS Stock No. 763-9374
Mfr. Part No.XUMTAPCNL03M12
$258.50
Each
units
Block Retroreflective 1 m PNP 4-Pin M12 Connector - - 12 → 24V - Infrared IP67 100 mA - 1 ms
RS Stock No. 842-3007
Mfr. Part No.Q20PDL
BrandBanner
$197.30
Each
units
Block Diffuse 800 mm PNP Cable - - 30V - LED IP67 18 mA - 800 μs
RS Stock No. 289-2508
Mfr. Part No.E3SR12
BrandOmron
$407.31
Each
units
Block Retroreflective 100 → 300 mm NPN 3-Wire Cable 2m - - 30V - Infrared IP67 100 mA - 1 ms
RS Stock No. 125-4577
Mfr. Part No.PM-R65W-P
BrandPanasonic
$32.13
Each
units
Fork Through Beam (Fork) 6 mm PNP 4-Pin Connector - - 24V 4-Pin Connector Infrared IP40 50 mA - 20 μs, 80 μs
New
RS Stock No. 201-0788
Mfr. Part No.EP1820PPAS-1
$183.88
Each
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Barrel Retroreflective 2 m PNP Plug - - - - - - - - -
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